Returns the usage message. If any other options are provided, they will be ignored.

–library or -l

Expects a single argument, a string specifying the library directory to parse. If this option is not specified,
it will assume the current working directory.

–output or -o

Where to write the autoload class map file. If not provided, assumes “autoload_classmap.php” in the library directory.

–append or -a

Append to autoload file if it exists.

–overwrite or -w

If an autoload class map file already exists with the name as specified via the --output option, you can
overwrite it by specifying this flag. Otherwise, the script will not write the class map and return a warning.